Practical Fundamentals of Chemical Engineering - EIT ...
2.5 Molecular weight. The molecular weight of a substance is the weight in atomic mass units of all the atoms in a given formula. An atomic mass unit is defined as 1/12 the weight of the carbon-12 isotope. The old symbol was amu, while the most correct symbol is u (a lower case letter u). Carbon-12 is defined as weighing exactly 12 amu.
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